straeten



H. STFIAETEN.

GRATE FOR BOILERS.

APPLICATION FILED DIic.29. I9I3.

vPatented Aug. 8,1916.

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l I l l I /m In H. STRAETEN.

GRATE FOR BQILERS.

APPLICATION FILED DEC. 29. |913.

1,193,782- PatentedAug. 8,1916. N3

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IIUMIN J is provided with TS YI FQ.'

HUBERT STRAETEN, OF CHICAGO, ILLINOIS,'ASSIGNOR TO S. & S. AUTOMATIC GRATE COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

GRATE FOR BOILERS.

Specification of Letters Iatent.

j Patented Aug. 8, 1916.

To all 'whom t may concern.'

Be it known that I, HUBERT STRAETEN, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Grates for Boilers, of which the following is a specification.

The essential object of this invention is to provide certain new and-useful improvements upon the grate for boilers sho-wn and described in United States Letters Patent No. 706,275, dated August 5, 1902, and more specifically the object of the invention isvto provide means for preventing the admission of excess amounts of air to that part of the grate where the process of combustion is taking place.

In the drawings, Figure 1 is a longitudinal sectional view of the fire bo-x below the boiler showing the traveling grate mechanism; Fig. 2 is a view of the exterior o-f the grate box looking toward the right, Fig. 1; Fig. 3 is a view of the trap which is provided near the right end, Fig. 1; Fig. 4 is a view of one of the trap members shown in Fig. 3; Fig. 5 is a view of the device within the grate box for scraping the bottom surfaces of the under row of grates; and Fig. 6 is a view of the part shown in Fig. 5 at a dierent angle.

The various parts which are common to this application and to the aforesaid Patent No. 7 06,27 5 are herein designated by the same reference numerals as were employed for like parts in said patent, and those parts are not described in detail. The grate bars 15 are supported by I-beam's upon the links 9,

which links are connected together so as to provide an endless chain or chains, as more fully described in said prior patent. rIhe links are supported upon the rails 1 so as to hold the grate bars 15 at the proper height when the fuel from the fuel lbox 35 has dropped upon the grate.

In order to prevent the entrance of too great amounts of air, the front of the grates is covered over by the casing 36, which casing doors 37 and 38 hinged to the main casing at 39 and 40. If it be desired to admit certain quantities of air into the combustion chamber, one or both of said doors 37 and 38 may be opened or the doors may be kept closed, as circumstances may make necessary.

At the rear end of the boiler are the pipes 41 and 42, pipe 42 being the pipe through which the water is fed or injected into the boiler. In the framework of the boiler or in the brick work which supports the same, is the rod or shaft 43, and from this the several ears or lugs 44 are pivotally supported, the shaft 43 being adapted to pass through perforations 45 in the members 44. Each member 44 is provided with an ear or projection 46 adapted to be received within the recess 47 in the brick work. The members 44 are loosely mounted upon shaft 43 and are adapted to be pushed from full line position, Fig. 1, to or toward the dotted line position. Normally, and in the full line position, said members 44 practically close the space 43 which is between thel top of the grate bars 15 and the upper wall 49 of the combustion chamber, or as it may be termed the bridge wall arch, but whenever any grate bar 15 passes beyond said depending lugs 44, and especially in cases where there is any large piece of ash or cinders upon said grate bar, the member 44 will be liftedout of the way and pushed to the dotted line position so as to permit the discharge of such extra large cinder. The ear or projection 46 which is normally received within the recess 47 assists in preventing ingress of air into the fire-box when same is not desired.

Beneath the endless chain and beneath the grate bars 15 when they are in the lowermost position, is an angle iron 50, the purpose and object of which is to scrape the moving grate bars as they pass thereover in order to scrape off and remove any cinders or clinkers which may 1have adhered to the grate bars. Said angle iron is carried upon bars 51 which are received within perforated blocks 52, set-screws 53 being adapted to hold said bars 51 in place and to permit adjustment of same in varying positions. A hook 54, which is adapted `to catch upon some suitable projection 55, keeps one edge of angle iron 50 pressed against the grate bars 15. The proximity of the swinging lug 44 to the water pipe 42 will prevent said lugs from becoming heated to such an extent as to cause the same to melt or burn away.

As best shown in Fig. 1, the boiler casing, which is preferably made of brickwork or other suitable material, is placed above that wheel at the right end over which the endless chain is adapted to travel, and said casing is provided with the recess 44il within which the swinging lugs 44 are received.

Said recess 44a is substantially triangularin cross-section so as to permit only a limited movement to the lugs and the lugs normally lie in substantially vertical planes, although as hereinbefore stated, they can move to the dotted line positions under certain conditions. The recess 47 is in communication With therecess 44a, and the pipe 4l forms one wall of the recess 47, and the recess 47 extends to the pipe 4l as does the recess 44L at its upper end. Because of this construction the upper end of each lug can either engage or come very closely adjacent to the pipe 4l and the ears 46 also made to engage said pipe. Because of the fact that the lugs are either in close proximity to or in engagement with the pipe, they are normally cooled at all times, and the tendency to burn out the lugs is much reduced if not entirely prevented.

I claim as my invention:

l. In a device of the class described, an endless chain stolzer, a pair of Wheels around which said chain stoker is arranged, a boiler casing having recesses of unequal size with the smaller recess formed in a Wall of the larger recess, lugs pivotally supported in the larger of said recesses and having projecting portions tting in the smaller of said recesses.

2. In aI device of the class described, an endless chain, Wheels upon which said chain is supported, grate bars carried by said chain, a casing provided with a recess in its top Wall, and a second smaller lateral recess in the side ivall of said first mentioned recess, a rod mounted in the upper extremity of said iirst mentioned recess, a plurality of lugs within said iirst mentioned recess and pivotally depending from the rod, and laterally extending portions on said lugs adapted to project into the smaller lateral recess.

3. The combination of a chain grate stoker comprising grate bars supported pon endless chains, the boiler casing being recessed, lugs pivotally supported in said recess, and an ear upon each lug, said boiler casing being provided with a second recess adapted to receive said ears.

4. In a device of the class described, an endless chain stolzer, a casing inclosing said stoker and having two recesses, one of which is smaller than and is formed in the Walls of the other, lugs pivotally supported in the larger recess, and ears on said lugs projecting into the smaller recess.

5. The combination of an endless chain Stoker, a pair of Wheels over which said chain is adapted to travel, a plurality of pivotally-supported lugs adapted to come closely to the grates, said lugs being disposed intermediate the axes of said Wheels and normally lying in substantially vertical planes, the boiler casing being recessed to receive said lugs, means upon Which said lugs are pivotally mounted, and a cooling pipe disposed adjacent said lugs, said pipe forming part of the Wall of the recess Within which said lugs are received, thereby to permit said lugs to engage said pipe.

6. The combination of an endless chain stoker, a pair of Wheels over Which said chain is adapted to travel, a plurality of pivotally-supported lugs adapted to come closely to the grates, sait lugs being disposed intermediate the axes of said Wheels and normally lying in substantially vertical planes, the boiler casing being recessed to receive said lugs, means upon vvhich said lugs are pivotally mounted, and a cooling pipe disposed adjacent said lugs, said pipe forming part of the Wall of the recess Within which said lugs are received, thereby to permit said lugs to come closely adjacent to said pipe.

7. In a device of the class described, a stolzer, a casing inclosing said Stoker and having a plurality of recesses, one of which extends laterally to and is formed in one of the Walls of another recess, lugs pivotally supported inpone of said recesses and lateral ears on said lugs projecting into the lateral recess.

In testimony whereof I hereunto ailix my signature in the presence of two Witnesses.

HUBERT STRAETEN.

Witnesses:

ROBT. KLOTZ, MAY D. F LYNN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of `'Patents. Washington, D. C. 

